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TitleZircon from altered monzonite rocks provides insights into magmatic and mineralizing processes at the Douay Au Project, Abitibi Greenstone Belt
AuthorMathieu, LORCID logo; Wasuita, T D; Sherlock, R; Speidel, F; Marsh, J H; Dubé, B; Côté-Mantha, O
SourceGeosciences vol. 12, issue 114, 2022 p. 1-29, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20220045
Mediapaper; digital; on-line
File formatpdf
ProvinceOntario; Quebec
Lat/Long WENS -80.0000 -78.0000 50.0000 49.0000
Subjectsmineralogy; igneous and metamorphic petrology; syenites; carbonatites; intrusions; gold; magmatic deposits; hydrothermal systems; Abitibi Greenstone Belt
Illustrationslocation maps; tables; photographs; composite sections; images; plots; geochronological charts; Concordia diagrams
Released2022 03 02
AbstractZircon provides essential information on the age and oxidation state of magmatic systems and can be used to characterize magmatic-hydrothermal Au mineralizing systems. Using the Douay intrusion-related gold system (IRGS) as a type example of Neoarchean syenite-associated mineralization (Abitibi greenstone belt), we demonstrate that zircon from altered quartz-monzonite rocks can also be used to infer the age of a magmatic-hydrothermal event. Here, zircon chemistry is used to identify the following sequence of events at the Douay exploration project: (1) the crystallization of zircon at ~2690 Ma in evolved residual melts with distinct U-contents (quartz-monzonite magma); (2) the extensive radiation damage for the U-rich grains over a period of ~10-15 My; and (3) the alteration of zircon grains at ~2676 Ma by interaction with magmatic-hydrothermal mineralizing fluids derived from syenite and carbonatite intrusive phases. This study also distinguishes extensively altered zircon grains from pristine to least-altered zircon formed in distinct magmatic environments using a Th/U vs. U discrimination diagram.
Summary(Plain Language Summary, not published)
This article presents results of a study of the magmatic rocks that host the auriferous mineralization of the Douay deposit in the Abitibi-Temiscamingue region of northwestern Quebec. The chemistry of zircon, a common mineral in magmatic rocks, allows to document the deposit formation.

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